fix(firmware): refresh release_bins to v0.6.5 — fixes node_id=1 on all nodes (#679)

release_bins/ was built from v0.4.3.1 and predated the early-capture
node_id fix (PRs #232/#375/#385/#390). Every device flashed from those
binaries emitted node_id=1 regardless of provisioned ID, making
multi-node deployments appear as a single node.

Changes:
- Rebuild all 6 release_bins/ binaries from v0.6.5 source (2026-05-20)
  - esp32-csi-node.bin (8 MB, 1,110,384 bytes)
  - esp32-csi-node-4mb.bin (4 MB, 894,352 bytes)
  - bootloader.bin, partition-table.bin, partition-table-4mb.bin, ota_data_initial.bin
- Add release_bins/version.txt (0.6.5 / git-sha: d72e06fc8)
- README: add Step 0 "Pre-built binaries" flash command with version reference;
  update expected boot output to show early-capture log line
- provision.py: fix write-flash → write_flash (esptool v4.10+ underscore API)

Validated on real hardware (COM7 — ESP32-S3 N16R8, node_id=2):
  I (396) csi_collector: Early capture node_id=2 (before WiFi init, #232/#390)
  I (406) main: ESP32-S3 CSI Node (ADR-018) — v0.6.5 — Node ID: 2

Closes #679

firmware/esp32-csi-node/provision.py

@@ -294,7 +294,7 @@ def flash_nvs(port, baud, nvs_bin, chip):
             "--chip", chip,
             "--port", port,
             "--baud", str(baud),
-            "write-flash",
+            "write_flash",
             hex(NVS_PARTITION_OFFSET), bin_path,
         ]
         print(f"Flashing NVS partition ({len(nvs_bin)} bytes) to {port} (chip={chip})...")
@@ -499,7 +499,7 @@ def main():
             f.write(nvs_bin)
         print(f"NVS binary saved to {out} ({len(nvs_bin)} bytes)")
         print(f"Flash manually: python -m esptool --chip {args.chip} --port {args.port} "
-              f"write-flash 0x9000 {out}")
+              f"write_flash 0x9000 {out}")
         # Persist merged state even on dry-run so a subsequent real flash from
         # this machine sees the same staged config.
         path = save_state(args.port, args.state_dir, merged)